Charles m



'(Nonoaem c. M. BURGBSS.

KNOB ATTAGHMENT 10.472,725. Patented Apr. 1.2, 1892.

@d gg M2206 UNITED STATES PATENT CEFrcE.

CHARLES M. BURGESS, OF NEW BRITAIN,VCONNECTICUT, ASSIGNOR TO THE RUSSELL da ERWIN MANUFACTURING COMPANY, OF SAME PLACE.

I KNOB ATTACHMENT.

SPECIFICATION forming part of Letters Patent No. 472,725, dated April 12, 1892. Application tiled December 19E, 1891. Serial No. 415,632. (No model.)

To all whoml t may concern:

Beit known that I, CHARLES M. BURGEss, a citizen of the United States, residing at New Britain, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Knob Attachments, of which the following is a specification.

My invention relates to an improved knob attachment; and the object of my improvement is to provide a simple and efficient attachment in which the spindle will better t the hole in the knob and thereby enable the knob and spindle to be more securely attached.

In the accompanying drawings, Figure l is a side elevation of a portion of my knobspindle with knob attached thereto; and Fig. 2 is an enlarged sectional view thereof on the line a; x of Fig. 1, the fastening-screw being shown in elevation.

I make the knob-spindle of two longitudinal parts a b, each of which is in cross-section substantially in the form of a trapezoid or right-angled triangle. These two parts when placed with their oblique faces together form the complete knob-spindle, which is rectangular in cross-section and which will substantially it the ordinary hole or socket in theknob-shank C. This knob-spindle will of course be of the usual or any desired length Y and extend through the hub of the latch.

said spindle. The knob may be slipped along to the desired point on the complete spindle 4o and then secured 4by turning in the screw. The screw will bear upon one part of the spindle as, for instance, the part b-and force that partagainst the other part a, when under the action ot' the oblique faces of said 45 spindle longitudinally, with the confronting 5o faces of the two parts extending obliquely to its sides, enables me to make said spindle have aiirin bearing upon all sides of the socket when the knob is secured thereto, so

that it is not liable to be Aaccidentally displaced even when fastened by merely turning up the screw. The spindle will also have a iirmer and better bearing in the latch-hub, while at the same time there is no perforation,

either threaded or otherwise, in either part of 6o said4 spindle. I claim as myinvention- The hereindescribed knob attachment, consisting of the two-part knob-spindle with confronting oblique faces, the knob having a socket for said spindle, and a fastening device located in the shank of said knob and bearing upon one of the right-angular side faces of said two-part spindle to force its parts together, substantially as describcd,.and for 7o the purpose specified. v

CHARLES M. BURGESS.

Witnesses:

THos. BISHOP, M. S. WIARD. 

